Kids travel free terms and conditions

Children aged 15 years and under travel free in Express Class when accompanied by a paying adult, or can travel unaccompanied if they have proof of air travel such as a valid flight booking or boarding pass. Photo ID will be required.
Heathrow Express will not take responsibility for children who are traveling alone. Parents/Guardians who allow their children to travel unaccompanied do so at their own risk.
Children aged 15 years and under travel free in Business First only if accompanied by an adult who has bought a Business First ticket. Children cannot travel unaccompanied in Business First.
There are no restrictions on the number of children who can travel at any one time, with or without an adult.
A child must still be issued a ticket to travel. A child ticket cannot be purchased on its own online, but it can be purchased alongside an adult ticket. Children traveling alone must get a ticket from a Heathrow Express member of staff, in terminal, station or on-board.